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Thread: Finder Bracket notch and Finder Mount tongue

  1. #1
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    Default Finder Bracket notch and Finder Mount tongue



    Newbie question. The bracket on my OTA for the finder scope has a notch in which a tongue on my finder mount mates. The bracket is mounted on my OTA with the notch facing toward the bottom (back?) of the OTA. This strikes me as that opposite of what I would expect. As is, if the locking screw on the bracket were to work loose my finder scope would slip out and hit my OTA. If the notch were facing the top (front?) of my OTA and the screw were to work loose this wouldn't happen since the tongue on my finder scope mount would still be trapped in the notch on the bracket.

    Am I missing something?

  2. #2
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    Default Re: Finder Bracket notch and Finder Mount tongue

    That is the normal standard and it works fine.
    Just tighten the holding screw firmly and it will hold in place without issue.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
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    Default Re: Finder Bracket notch and Finder Mount tongue

    Quote Originally Posted by Pogo007 View Post
    Newbie question. The bracket on my OTA for the finder scope has a notch in which a tongue on my finder mount mates. The bracket is mounted on my OTA with the notch facing toward the bottom (back?) of the OTA. This strikes me as that opposite of what I would expect. As is, if the locking screw on the bracket were to work loose my finder scope would slip out and hit my OTA. If the notch were facing the top (front?) of my OTA and the screw were to work loose this wouldn't happen since the tongue on my finder scope mount would still be trapped in the notch on the bracket.

    Am I missing something?
    Thanks Gabby76. Curious though about the "why" for this standard. One would naturally tighten the holding screw but accidents do happen so it would seem to me that reversing the bracket would guard against such accidents.

  4. #4
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    Default Re: Finder Bracket notch and Finder Mount tongue

    Just a repetitive design I imagine that has been the standard for decades.
    I have had a couple of heavier finders that had a shallow divot in the bracket foot for the bolt to fit into when attached.
    If your bracket is made of aluminium (not cast aluminium) you could do it yourself with a drill bit and put a 1mm divot for the bolt.

    What telescope do you have?
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
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    Default Re: Finder Bracket notch and Finder Mount tongue

    I have a SkyWatcher Flextube 250P. It just seems odd to me that the design isn't "flipped" with the bracket notch toward the top of the OTA and with the finder stalk tongue at the front of the stalk base. That way, if the stalk became loose in the bracket it would not fall to the ground when the OTA was above horizontal.

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    Default Re: Finder Bracket notch and Finder Mount tongue

    It may be a bit of a strange design but it works well, in all of the years of using them I have never had one become lose while using it.
    I have had OTAs that seemed tight on the mount and were not but never a finder.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
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    Default Re: Finder Bracket notch and Finder Mount tongue

    Yes I've recently bought the 90 degree 9x50 illuminated finder scope from orion for my skywatcher 120. and it slipped out very easily. I was horrified haha . I'm over the worry of marking things up and was quick to drill a small hole for the thumb screw as well. I've had the same problem with my 2 inch 90 degree diagonal but the tube is so thin that I hacksawed a slot in both thumb screws so I could nip the screws a little tighter. Its all a compromise on what is basicly the poor quality equipment forced on us by the manufacturer or our pocket....
    Phill. Dreaming of Clear Skys ....

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    Default Re: Finder Bracket notch and Finder Mount tongue

    Quote Originally Posted by Pogo007 View Post
    Thanks Gabby76. Curious though about the "why" for this standard. One would naturally tighten the holding screw but accidents do happen so it would seem to me that reversing the bracket would guard against such accidents.
    I believe the "Synta" finderscope base was originally designed to fit refractor focusers with integrated bracket. If you look at such focuser you will notice that this is the only way to insert the finder because integrated bracket has only one open end.

    In many years I had only one accident when heavy finder slipped out in the middle of observing and hit the floor. Since than I use a string to tie heavy finders to the screw.

    On a few of my scopes I have brackets with two screws which are more secure. Ironically they don't have the notch to accommodate the tongue.

    https://www.ebay.com/itm/Multi-Funct...item2cc3020c51
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